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Noun: cosmic microwave background
  1. (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
    "Scientists study the cosmic microwave background radiation to understand the early universe";
    - cosmic background radiation, CBR, cosmic microwave background radiation, CMBR, CMB

Type of: cosmic radiation

Encyclopedia: Cosmic microwave background